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Inventories (Tables)
12 Months Ended
Dec. 31, 2011
Inventory Net (Tables) [Abstract]  
Inventory Components
 December 31,
 2011 2010
Raw materials and work in process $ 63,216 $ 60,465
Supplies and service parts   68,600   65,878
Finished products   71,958   68,941
Inventory at FIFO cost  203,774   195,284
Excess of FIFO cost over LIFO cost  (25,175)   (26,317)
Total inventory, net $ 178,599 $ 168,967